Machine for making lock-joined angular metal tubing.



J..STANDER. MACHINE FOR MAKING LOOK JOINED ANGULAR METAL TUBING.

APPLICATION FILED APR. 12, 1911.

Patented Apr. 9, 1912.

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MACHINE FOR MAKING LOOK JOINED ANGULAR METAL TUBING.

' APPLICATION FILED APR. 12, 1911.

Patented Apr. 9, 1912 2 SHEETS-SHEET 2.

JACOB STANDER, OF BROOKLYN, NEW YORK.

MACHINE FOR MAKING LOCK-JOINED ANGULAR METAL TUBING.

Specification of Letters Patent.

Patented Apr. 9,1912.

Application filed April 12, 1911. Serial No. 620,559.

To all whom it may concern:

Be it known that I, JACOB STANDER, a citizen of the Empire ofAustria-Hungary, and a resident of Brooklyn, county of Kings, and Stateof New York, have invented certain new and useful Improvements inMachines for MakingLock-Joined Angular Metal Tubing, of which thefollowing is a specification.

This invention has reference to improvements in a machine for makinglock-joined angular metal tubing to be used in orna mental bedsteadswhich are usually made of brass and iron.

It is the special purpose of this invention to produce a machine formaking angular tubing which is of simple construction and althoughrather wide may be operated by one workman. Means are provided in themachine which render it .adapted for the production of rectangulartubing of square and oblong cross section as well as tubing having otherangles. Metallic tubing to be used in the manufacture of bedsteads mustbe smooth on the outside without any projection 011 the lock-joint. Thepresent machine produces such tubing in a quick reliable and inexpensivemanner and care has been taken to produce a strong and compact machineall as will be fully described hereinafter with reference to theaccompanying drawings in which:

Figure 1 represents in front elevation a machine for making lock-joinedangular metallic tubing which embodies in desirable form the presentimprovements. Fig. 2 shows this machine in top plan view. Fig. 3 is anend elevation of same. Fig. 4 is a detail section on an enlarged scaleon line 4-4 of Fig. 1. Figs. 5, 6, 7 and 8 show metal sheeting preparedfor making angular tubing and Fig. 9 illustrates the metal sheetingduring various stages of making the tubing. Fig.'10 is an enlargeddetail View of the die-mechanism shown in Fig. 4.

Similar characters of reference denote like parts in all the figures. Inthedrawing in Fig. 1 a represents upright and parallel substantialframes connected in the upper part 'by a stationary table plate orplaten Z2 having strengthening end ribs 0 which are connected tothe sideframes a by bolts 0?. A shaft 6 is mounted in the upper portion of theside frames a. This shaft has two c'amportions e one on each outerportion near the side frames a of which cams one is shown in Fig. 4.

Around each cam 6 there is a bearing f leaving sufficient play for theoperation of V the cams. These bearings are part of a horizontalsubstantially fiat topped clamp plate f which thus is suspended thereonand is moved up and down when the shaft 6 is turned a quarter of arevolution by a hand operated lever g secured to said shaft 6. The plateis guided by two studs 7 integral thereon and passing into correspondingcircular borings in the table plate I) as shown in Fig. 4. On the frontof the plate f there is secured in any suitable manner a plate Itforming the tool for clamping the metal sheeting. This plate ispreferably of steel. The stationary plate 6 which may be of cast ironmay also have along its front edge an extra plate 2' of hardenedmaterial, such as steel. Pivoted to the side frames a there is a strongdie-carrying plate j which plate 71 is held in place by a plate Z boltedto the plate 7'. A plurality of angle irons m are secured to the plate Zwhich angle irons carry each an adjustable gage or guide a fordetermining the distance to which the metal sheeting is to be insertedinto the machine. Each guide has a rear projection n against which themetal sheeting rests during the operation of the machine.

In order to ease the work of the operator the weight of certain parts ofthe machine is counterbalanced. This mechanism comprises essentially twopivots j of the plate j which extend beyond the side frames a and carryeach an arm j extending downwardly parallel tothe plate j. The lowerportion of each arm y? carries a pin j to which a chain 0 is secured.The chain 0 passes over a loose roller 79 on the shaft 6 and acounterweight g is carried by the second end of the chain 0. The plate jis provided with two hand levers j by means of which it may be leverscan not be reached by one workingman at the same time. Therefore thecounterweights are provided which in the normal position of the plate jtend to draw the plate j upwardly and rearwardly, see Fig. 3. lVhen theplate j is lifted the chain 0 passes around the roller 79 and the .arm7' swings to the left in Fig. 3 while the chain passes beyond the centerof the pivot j whereby the counterweight balances the weight of theplate j. A scale of openings 1" in one of the side frames is purposedfor receiving a pin r to limit the movement of the arms j wherebyvarious tubes with various angles may be produced having for instanceangles of 30, 45, 60 and 90 degrees.

From the foregoing description, it will be observed that the practicalfeature of the invention resides in the employment of a substantiallyfiat topped clamp plate movable toward the fiat platen and provided atone edge portion with a downwardly projecting clamping rib :0, in rearof which rib the under side of said clamp plate is cut away at g toprovide a clearance space to receive the previously bent parts of theblank, in combination with a die plate hinged at the front edge of thebed plate, said die plate having in its upper outer face a longitudinalgroove that receives one of the first bent edges when the third bend isbeing made adjacent that edge.

The operation of the machine is substantially as follows: First, a pieceof metal sheeting 8 cut to proper size is inserted into the machine sothat its front edge is in line with the front edge of the plate is. Nowthe hand lever g of the shaft 0 is turned down by the operator wherebythe plate f is lowered and the tool plate It thereon presses the metalsheeting .9 down upon the steel plate 2'. The hand levers 7' are thenmoved upward thereby turning the plate j with all the parts connectedthereto until the upper surface of the plate is presses the frontportion of the metal sheeting .9 against the upper surface of the narrowfront portion of the plate h producing thereby one short acute angularbend on the metal sheeting shown in Fig. 6 and marked 1. The lever g isnow swung backward into its normal position shown in Fig. 3 whereby theplates f and h are raised. The sheet 8 may then be withdrawn andinserted again with its opposite end to bend said end portion in theopposite way, shown in Fig. 7 and designated 2. In like manner the sheet8 is again withdrawn and inserted again but so that the bent portionfirst inserted stands upward and to make room for said bent portion theplates f and h are cut out as shown in Fig. 4. The other bend is now inthe front and rests in the groove 76 of the plate above referred to. Thepin 7 which is inserted in one of the openings 1" determines now theangles of the tubes to be made. By

operating now the levers j* the plate j is again swung upward until thearm j rests against the pin 1. Thereby the short bend is made as shownin Fig. 8 and marked 8. The sheet 8 is now placed against the shoulder11 of the guide n which of course was properly set for the required sizeof the tube. Upon the operation of the lever g and the levers j onelarge bend is made for one side of the tubing, as shown in Fig. 9 andmarked t. The lever g is then returned and the sheet 8 moved against theshoulder 12 of the guide 12, and the second side turned marked 5 in Fig.9. This is repeated to bend the third side whereby the tube iscompleted. During these operations the first bent side slides along thetop surface of the plate f keeping the interlocking end portionssomewhat apart. Owing to the elasticity of metal sheeting theseinterlocking parts may be easily joined as soon as the tube is taken outof the machine. The locked short bends l and 2 are then finished in aseparate machine.

It will thus be observed that the distinctive feature of this machineresides in its capability of producing, in a single blank of sheetmetal, all of the corner bends, as well as the edge bends for the lockjoint, of an angular metal tube which is particularly designed for usein the manufacture of metal bedsteads. That is to say, this machineproduces, at opposite side edges of the metal blank, the initial edgebends to form the lock joint or seam of the tube, then the returned bendin one side edge for the lock joint or seam, and then the several cornerbends in succession to develop the tube form of the article, after whichthe bends for the lock joint are closed by a separate machine to makethe seam and thereby complete the tube.

I claim as my invention:

1. In a metal tube-forming machine, the combination of a flat platen, aclamp plate movable toward the platen and provided at one edge portionwith a projecting clamping rib for binding engagement with the metalblank, a die plate having a hinged support at the front edge of theplaten, said die plate presenting a flat top surface, normally flushwith the platen of the machine, and having at its upper outer face alongitudinal groove that receives one of the first bent edges when thethird or return bend is being made in the blank adjacent such edge.

2. In a metal tube forming machine, the combination of a fiat platen, aclamp plate movable toward the platen and provided at one edge portionwith a downwardly projecting clamping rib, in the rear of which rib thesaid clamping plate has its underside cut away to provide a clearancespace to receive the previously bent parts of the blank,a die platehaving a hinged support at the front edge of the platen, said die platepresenting a flat top surface, normally flush with the platen of themachine and having in its upper outer face a longitudinal angular groovethat receives one of the first bent edges when the third or return bendis being made in the blank adjacent such edge, the clamp plate beingfurther provided With a substantially fiat top to permit the blank tooverlie the same during the making of the 10 third and next succeedingbends, asset forth. Signed at New York, N. Y., this 11th day of April,1911.

JACOB STANDER.

WVitnesses CORINNE MYERS, VERA- PAULSEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

